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A heavens city of 300000 stars
A heavens city of 300000 stars
Pascal


Photograph Information Photographer's Comments
Challenge: Night Sky (Advanced Editing VII*)
Camera: Canon EOS-350D Rebel XT
Location: Kariani, Greece
Date: May 30, 2008
Aperture: f/6.3
ISO: 400, 800, 1600
Shutter: 742 sec (total)
Galleries: Sky, Astrophotography
Date Uploaded: Jun 3, 2008

Located 25000 light years away the great globular cluster M13 in Hercules is one of the showpieces this season every year at the Northern celestial hemisphere.
M13 is one of the dozens of globular clusters that are scatterd in a halo around Milky Way, our galaxy. Its view is spectacular through an 8 inch (tube diameter) telescope, though it can be easily observed even with binoculars.
Its angular diameter of 20' corresponds to a linear 145 light years across, while visually it is perhaps 13' large. It contains more than 300,000 stars. Towards its center stars are about 500 times more concentrated than in our solar neighbourhood. The estimated age of M13 is between 11 and 12 billion years.
Nearby, about 40 arc minutes north-east of M13, is the faint galaxy NGC 6207, visible here at the left-down corner.

10 exposures were combined in order to get this final image, more specifically:
120 sec in ISO 800
120 sec in ISO 400
82 sec in ISO 1600
7 x 60 sec in ISO 1600
All the exposures were unguided; the Takahashi EM200 mount after a careful balance of the counterweights and precise polar alignment was absolutely perfect.

Equipment that was used:
Image scope : Celestron C8 SCT with focal reducer at f/6.3
Mount : Takahashi EM200 Temma II Jr








Statistics
Place: 15 out of 46
Avg (all users): 6.3452
Avg (commenters): 6.8750
Avg (participants): 6.3793
Avg (non-participants): 6.3425
Views since voting: 1282
Views during voting: 754
Votes: 394
Comments: 27
Favorites: 1 (view)


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AuthorThread
06/11/2008 09:29:04 PM
I may be wrong but I think that if you're talking "universe" and not just our "clumped galaxy" I think that a random line is more likely to never "hit" a star.

Although there are more stars in the universe than grains of sand on the Earth, there is MUCH more empty space !

If you remember the scientist that said different please let me know. I'd like to read what he has to say.

Originally posted by Zoomdak:

Truly amazing how many stars are in the sky. There is a statement by some astronomer at some time that if you point any direction to the night sky, if you follow a direct line from that you will eventually reach a star (even in we can't see it from earth). For the universe is so expansive, that there is an infinite possibility of that line hitting a star.
I like this, especially that you've captured this cluster so well, but I'd rather have the focal point off center.


Message edited by author 2008-06-11 21:30:25.
  Photographer found comment helpful.
06/11/2008 12:48:21 AM
thanks for explaining how you did this, very nice work
  Photographer found comment helpful.
06/11/2008 12:38:44 AM
Very nicely done! Was just reading the comments, you can tell all of us astro-geeks who recognized this as M13 LOL!

I would love to have a Tak mount, I have an Astro-Physics refractor but the clock drive on my mount doesn't work!!

Again, a great effort
  Photographer found comment helpful.
 Comments Made During the Challenge
06/10/2008 03:41:50 PM
Truly amazing how many stars are in the sky. There is a statement by some astronomer at some time that if you point any direction to the night sky, if you follow a direct line from that you will eventually reach a star (even in we can't see it from earth). For the universe is so expansive, that there is an infinite possibility of that line hitting a star.
I like this, especially that you've captured this cluster so well, but I'd rather have the focal point off center.
  Photographer found comment helpful.
06/10/2008 06:45:46 AM
Somebody's got a very nice 10" telescope! M13 I'm guessing. I doubt this will be appreciated by the dpc crowd for this amazing resolution, but I appreciate it, very very well done.
  Photographer found comment helpful.
06/06/2008 11:51:01 PM
The centering of the subject really doesn't work for me here. It doesn't need that position to draw interest and it removes focus from any other less bright, but interesting, patterns in the sky.
  Photographer found comment helpful.
06/06/2008 10:06:06 PM
Probably the best astronomy image in the challenge. (8)
  Photographer found comment helpful.
06/06/2008 11:26:54 AM
great shot! I shoud like to see this sky in my city...
  Photographer found comment helpful.
06/06/2008 02:51:24 AM
Like a galaxy in a galaxy.
  Photographer found comment helpful.
06/06/2008 12:51:12 AM
M13 perhaps? Nice image, well done.
  Photographer found comment helpful.
06/05/2008 10:26:16 PM
30,000 stars...amazing! it's good, but a little central...
  Photographer found comment helpful.
06/05/2008 09:34:20 PM
m13; sigh
  Photographer found comment helpful.
06/05/2008 07:00:03 PM
300,000 or 300,000,000,000???? our night time sky is just beautiful. I like this shot.
  Photographer found comment helpful.
06/05/2008 01:34:22 PM
Nice job here. I feel as if all the stars, and myself, are moving towards the cluster.
  Photographer found comment helpful.
06/05/2008 04:32:43 AM
Nice image.
  Photographer found comment helpful.
06/04/2008 09:42:54 PM
I'm getting the whooshing effect - very neat.
  Photographer found comment helpful.
06/04/2008 08:09:13 PM
Nice zoom.
  Photographer found comment helpful.
06/04/2008 06:40:33 PM
This is Astrophotography. This is the Night Sky. This is a 10.
  Photographer found comment helpful.
06/04/2008 04:15:58 PM
Bitchin globular cluster :)
  Photographer found comment helpful.
06/04/2008 11:02:19 AM
A very good capture, M2 or M5 i think. Like the sharpness and processing. The focus in extremely good! Regards!
  Photographer found comment helpful.
06/04/2008 05:29:33 AM
The shot is really nicely contrasted with not a lot of noise, the cluster of stars are nicely defined and bright.
  Photographer found comment helpful.
06/04/2008 04:58:43 AM
wonderfull !
  Photographer found comment helpful.
06/04/2008 03:45:25 AM
Oh my.....this is so pretty!!! You are brilliant to have captured something this heavenly with a regular earth camera!
  Photographer found comment helpful.
06/04/2008 03:07:02 AM
great shot
  Photographer found comment helpful.
06/04/2008 01:33:53 AM
Well, it is an interesting image.....is it real?
  Photographer found comment helpful.
06/04/2008 12:46:36 AM
M13? nice detail into the core
  Photographer found comment helpful.
06/04/2008 12:21:34 AM
interesting but boring at the same time
  Photographer found comment helpful.


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